I have found Takumars very erratic with metering, needing a lot of +EV compensation wide open, on my K-5. I think this is the nature of the Takumar beast. So long as the more sophisticated lenses are metering correctly, I wouldn't have an issue with that.
The AF problem, however, is far more of a concern. I would be talking to the seller about it at this point if I were you. Politely, but talking to them all the same. If they are honest and honourable, it should be easy to reach a satisfactory solution. (I have encountered this issue ONCE on e-bay, receiving a lens whose aperture had serious issues. My approach was polite but matter of fact about the fault; the seller was horrified, and appropriate restitution was swiftly offered.)
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